m2021 inverter lens adapter

adapter to use the included image inverter that ships with the m2021 nvg housing sold on alibaba. This is required to use the 10130 image intensifier tube. Original file was originally uploaded by DJGUNNER258 on Cults3d https://cults3d.com/en/3d-model/tool/m2021-lens-adapter

I smoothed out the outside edge in order to remove the flat surgaces and tightened the interior hole that the image inverter fits into.